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1 <br />' 16 December 2005 <br /> • AGE-NC Project No 97-0249 <br />' Page 3 of 8 <br />' 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain of custody form,placed in a chilled container and <br />' transported to McCampbell Analytical, Inc (MAI), a California Department of Health Services <br /> (DHS)-certified laboratory to be analysis for <br />' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) by EPA Methods 5030/8015Cm, <br /> • Benzene, toluene, ethylbenzene and xylenes (BTEX) by EPA Method 8021 B, <br /> I • 1,2-Dichloroethane (1,2-DCA), ethylene dibromide (EDB), tertiary butanol (TBA), dl- <br /> Isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and <br />' methyl-tertiary butyl ether (MTBE) by EPA Method 8260B <br />' 3.0. FINDINGS <br />' • Ground water elevations, general flow direction and the estimated gradient were determined from <br /> field data collected on 27 June 2005, the contaminant Impact to ground water was quantified by <br /> laboratory analysis of water samples collected on 27 and 28 June 2005 <br /> 1 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br />' The 27 June 2005 ground water elevations in wells MW-1 through MW-12 were calculated by <br /> subtracting the measured depth to ground water from the surveyed casing elevation The depth to <br />' ground water measurements varied between 7 60 feet(MW-6) and 11 17 feet (MW-7E) below the <br /> top of the well casings, ground water elevations were calculated to be between 0 97 feet(MW-10F) <br /> and 1 66 feet (MW-9A-C) above mean sea level On 27 June 2005 ground water elevations at the <br /> site averaged 1 46 feet above MSL Ground water elevations at the site decreased an average <br /> 0 64 feet between the March 2005 and June 2005 ground water monitoring events <br />' The ground water elevation data collected from the site was plotted for six Informal hydrologic flow <br /> units as defined in AGE's CPT Site Investigation - Fourth Quarter 2001 (dated 15 March 2002) <br /> I Hydrologic Units 1, 2 and 6 at Three B's Truck Plaza are laterally equivalent to Flag City's First <br /> Zone, Second Zone, and Primary Aquifer Zone, respectively, with the exception of minor <br /> Interpretational differences in location of hydrostratigraphic boundaries,Three B's Hydrologic Units <br /> 3 and 5 are laterally equivalent to Flag City's Rock Upper Zone and Secondary Aquifer Zone, <br /> respectively <br /> i <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />